Open AccessRisk factors for total hip replacement due to primary osteoarthritis: A cohort study in 50,034 persons
Author(s) -
Flugsrud Gunnar B.,
Nordsletten Lars,
Espehaug Birgitte,
Havelin Leif I.,
Meyer Haakon E.
Publication year - 2002
Publication title -
arthritis & rheumatism
Language(s) - English
Resource type - Journals
eISSN - 1529-0131
pISSN - 0004-3591
DOI - 10.1002/art.10115
Subject(s) - medicine , osteoarthritis , body mass index , confidence interval , relative risk , cohort study , cohort , risk factor , physical therapy , prospective cohort study , alternative medicine , pathology
Objective To identify prospectively the possible risk factors for total hip replacement (THR) due to primary osteoarthritis in a large cohort. Methods Data from a cardiovascular screening were matched with 9 years of national data on THR. Mean age at the start of followup was 54.9 years, and the 50,034 participants were followed up for an average of 9 years. During followup, 672 persons had a first THR due to primary osteoarthritis. Results We found dose‐response associations between body mass index (BMI), body weight, and the level of physical activity at work and THR for primary osteoarthritis. The highest versus the lowest quarter of BMI had a relative risk of 2.0 (95% confidence interval [95% CI] 1.4–2.9) among men and 3.0 (95% CI 2.1–4.1) among women. The highest versus the lowest quarter of body weight had a relative risk of 2.1 (95% CI 1.4–3.2) among men and 3.4 (95% CI 2.4–4.9) among women. Intensive versus sedentary physical activity at work had a relative risk of 2.1 (95% CI 1.5–3.0) among men and 2.1 (95% CI 1.3–3.3) among women. No association was found between physical activity in leisure and THR for primary osteoarthritis. Conclusion Intensive physical activity at work and a high BMI each contribute significantly to the overall risk of undergoing THR due to primary osteoarthritis. Lowering the exposure to these risk factors may substantially reduce the need for hip replacement.